ruby copy a paperclip attachment from one model to another?

Question

I have two models like this:-

Model 1 - card - contains a representation of data of interest for front page
attachment name = cardimage
Model 2 - user - c

Answer 1

old_avatar = model1.avatar;
model2.avatar.create(attachment: old_avatar.attachment);
model2.save;

It worked for me.

Answer 2

This should do the trick, you could use an after_create callback if the models are associated, if not I would recommend doing it in the controller action that creates the card.

instance_of_model_one.cardimage = instance_of_model_two.avatar
instance_of_model_one.save

Answer 3

Suppose you have 2 models:

• User
• Player

You have to copy profile_image from User with id = 1 to Player with id = 10. You can perform the following:

user = User.find(1)
player = Player.find(10)

player.profile_image = user.profile_image
player.save!

Sometimes this might save the file but with a file size of 0 Bytes. In such cases try the following:

user = User.find(1)
player = Player.find(10)

player.profile_image = user.profile_image.url
player.save!

This shall do the work!

Answer 4

Ideally, the approach mentioned by @cih should work:

instance_of_model_one.cardimage = instance_of_model_two.avatar
instance_of_model_one.save

But in my case, it was creating a blank file in S3. To resolve the issue, I tried the below approach and it worked:

instance_of_model_one.cardimage = instance_of_model_two.avatar.url
instance_of_model_one.save

Passing the URL instead of the object in the 1st statement resolved the issue.